Which of the following equation is incorrect?

9 + 11 = 11 + 9

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9 \times 11 = 11 \times 9

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9 - 11 = 11 - 9

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b and c both

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Solution

The correct option is C $9 - 11 = 11 - 9$
$9 + 11 = 11 + 9 = 20,$ according to the commutative property of addition.

$9 \times 11 = 11 \times 9 = 99,$ according to the commutative property of multiplication.

$9 - 11 = 11 - 9$ is not true as subtraction is not commutative.
Here, $9 - 11 = - 2$ and $11 - 9 = 2$
$\Rightarrow 9 - 11 \neq 11 - 9$

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